Question

1. Find the indicated probability (1 point) Refer to the table which summarizes the results of testing for a certain disease. Positive Test Result Negative Test Result Subject has the disease Subject does not have the disease 120 13 172 If one of the results is randomly selected, what is the probability that it is a false negative (test indicates the person does not have the disease when in fact they do)? What does this probability suggest about the accuracy of the test? 0.0421; The probability of this error is low so the test is fairly accurate O 0.570; The probability of this error is high so the test is not very accurate. 0 0.0323; The probability of this error is low so the test is fairly accurate 0 0.0129; The probability of this error is low so the test is fairly accurate.

Answer 1

1)
probability of false negative
= 4 /(120 + 4)
= 4/124
= 0.0323

option C) is correct

2)
total case   = 6 ,
{1,2,3,4}
favorable = 4
P(X < 5) = 4/6 = 2/3
option B)

3)
P(A') = 1 - P(A) = 1- 0.27 = 0.73
option C)
4)

option C) by definition

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